Dry cell



C. W. HAZELETT.

DBY CELL. APPLICATION FILED MAY 9, 1919.

1,33 1,763. Patented Feb. 24,1920.

INVENTOR 1:. .HAZELE T BY ma/g W .4 TYfORNE r v UNITED STATES PATENTOFFICE.

CLARENCE W. HAZELETT, 0F LAKEWOOD, OHIO, ASSIGNOR TO NATIONAL CARBONCOMPANY, INC., A CORPORATION OF NEW YORK.

DRY CELL.

Specification of Letters Patent.

Patented Feb. 24, 1920.

To all whom it may concern:

Be it known that I, CLARENCE W. HAZE- LETT, a citizen of the UnitedStates residing at Lakewood, in the county of luyahoga and State ofOhio, have invented a certain new and useful Improvement in Dry Cells,of which the following is a full, clear, and exact description.

This invention relates to electric batteries having zinc electrodes andone object is to permit the use of spot welding means for attaching thebinding post to the zinc. Other obj ects will appear in the appendeddescription in which:

Figure l is a view, with parts in section, of a dry cell zinc having azinc post spotwelded thereto.

Fig. 2 is a front View of the cell of Fig. 1.

Fig. 1. I

Fig. 4 is a top view of the zinc can of Fig. 1, showing the positionwhere the binding post is attached. I

Fig. 5 is a modified form of zinc binding 0st. p Fig. 6 is a stillfurther modification.

It is the usual practice to make dry cell binding posts of brass and tosolder them to the zinc can. This is more or less trouble when the cansare manufactured on a large commercial basis, and it is diflicult tocarry 011 the soldering process in such a way that one can be assuredthat there is a firm union between the post and the zinc can.Furthermore, solder is not a ve strong retaining medium and the hint ingposts frequently become loosened during shipment or while in use. Thisnecessitates the throwing away of the cell, especially when the bindingpost is loosened in use, as an average customer does not know how toresolder the binding post in position.

As far as I am aware, no one has ever been able to spot-weld a brassbinding post onto a zinc can, and this I think is due to the belief thatthe failure to weld is due to the inherent characteristics of the zinccan itself. I have found that this is not the case, but that the failureto weld is due to the use of two different materials having.

quite widely separated melting points. Consequently the two cannot becaused to ]01I1 by welding.

I overcome the difficultyby forming the binding posts of zinc or somemetal or alloy having substantially the same melting point as zinc, zincpreferably being used on account of low cost. I form the binding post inany desired way, preferably in the shape of a plain screw rod 1 having ashoulder 2, such as shown in Fig. 3. The zinc can 3, when this type ofpost is used, is indented at 4, as shown in Fig. 4:, for a shortdistance below the top of the can. The zinc post 1 is then placed in thedepression or trough 4: with the screw threaded portion extending abovethe can. The can and the post are then placed in the spot-weldingmachine and current passed through the post, causing spot-welding, asshown at 5 in Flg. 2. Fig. 3 is a view of the zinc post shown in Thereis no joining material to be added 7 to the can, as in the solderingprocess, but the entire operation of indenting the can, feeding thescrew post into the depression, and the spot welding of the post to thezinc, can be carried on entirely by automatic apparatus without anydifliculty.

My invention of course is not limited to any particular type of post,and in Figs. 5 and 6 I have shown modified forms,.but by way of exampleonly. In Fig. 5 the zinc post 6 is cut away at 7 or otherwise formedwith a reduced shank, so that it can be spotwelded to the can withoutforming the indentation 3 described in connection with the preferredform. In Fig. 6 the zinc post 8 has a slot 9 in the lower portionadapted to receive the top of the zinc can. In 'both of thesemodifications the post will be spotwelded to the zinc. Various othermodified forms of post may be used without departinglfrom the spirit ofthe invention.

aving described my invention, what I claim is:

1. In dry cells, a zinc container electrode, a zinc binding postthereon, said zinc post being welded to said container.

2. In dry cells, a zinc container electrode having a trough-shapeddepression adjacent its top, a zinc binding post in said depression,said binding post being welded to said container.

In testimony whereof, I hereunto affix my signature.

(J. W. HAZELETT.

